Apparatus for manufacturing tubes and the like.



' PATENTED JAN. 22, 1907.

S.PBANK. APPARATUS FOR MANUFACTURING TUBES AND THE LIKE.

APPLICATION FILED SEPT. 22,1904.

UNITED STATES PATENT OFFICE.

SALOMON FRANK, 0F FRANKFORT-O'N-THE-MA-IN, GER-MANY:

APPARATUS Foe MANUFACTURING TUBE'S AND THE LlKE.

' Spcificationpf Letters Patent.

' Patented Jan. 22,1907.

Acplication filed September 22, 1904. Serial No. 226,423.

To all whom, it Magoo/warn:

Be it known that I, SALOMON FRANK, a citizen of the Empire of Germany, residing in Frankfort-on-the-Main, in said Empire, have invented certain newxand-useful Improvements in Apparatus for Manufacturing Tubes and the Like, of which the following is a specification.

This invention aims to provide an ap a-- ratus by means of which tubes and similar articles may be very readily and efliciently manufactured fromsemihard metals merely by the a 'plication of'pressure and without the use 0 heat. I s A further object of the invention is to pro: vide an apparatus for this purpose in which the ressure is so applied to. the block of metal om which the tube is to be formed that the pressure re uiredfor obtaining the flow of the meta Without the application of heat is reduced to a minimum, the apparatus being sufliciently strong to resist the pressure in question without undergoing any deformation.

The accompanying drawing. illustrates in vertical section an apparatus constructed in accordance with the inventlon.

In the drawin b denotes apress-block. which ispreferab y cylindrical and which is provided with an interior bore. Within said bore is fixed in any approved manner a bushing Z)- of hard metal, saidbushing being provi ed WithfitbOl'G b passing therethrough. The bushing bis counter-bored, so that one end of its bore isof greater diameter than the other end. Seated in the part of the bore which-is of reater diameter and 'abutting against 'the s oulder formedin the bore is a bottom block g, having a slightly concave.

its convexity conformin exa'ctl to theconcavity of the bottom b ock. urthermore, the working end of said plunger is of greater except at said edge.

, The forward working end e of the plunger 0 is made convex,

diameter than the portion at the rear of said end, said. plunger being cut awa sharply and reduced in diameter immediat yat the rear of its enlarged end.

In practice. a block which the tube is to be madeis placed within the bore b abutting. against the bottom a of the material from V block 9. It is important that this block of metal fit snugly within said bo're-that is to say, .the diameterv of said block must corre- I spond to the diameter of said bore.

When the block has been placed in position, as indicated, the plunger e is forced inwardly ,byany suitable means "into the bore btand against the block of metal. The action of the plunger is such as to cause the compressionofthe metal'between the enlarged convex working end, of the plunger and the con-.

. cave surfa'ceof the bottom block, whereby the metal'is forced laterally to either side of said plunger and bottom block and rearwardly out of the bore. The edge of the enlarged workin end of the plunger forms the open- 'n wit 'n the. tube, the mner surface 0 the tu e not being in contact with the plunger I .By this arrangement there. is no friction created between the inner surface of the tube and the plunger. only friction whichis produced is between The I the outer surface'of the tube and the bushin b; but this is inconsiderable and the-meta readily slides along the inner surface of said bushing toward the outer end of the bore.

By the arrangement described the pressure of the plunger is-so a plied to the block of metal that the friction between the metal acted u on and the bore of the press-block is reduce tea-minimum, and consequently the pressure required for'the formation of tubes in accordance -with the invention is also reduced to a minimum. Further, by the arrangement described metal tubes may be very q ckl manufactured without the ap-,

plication of eat.v c

Having thus described mv invention, I

,claim as new and desire to seeure by Letters Patent' In an a paratus for manufacturing metal tubes wit out the application of heat, the r combination of a press-block having a bore, aibottom block fixed in said bore and pro-'- vided with a slightly concave working surface, and a plunger movable in said bore and provided ,With an enlar ed convex Working In testimony whereof I have signed this end, the convexity of which corresponds to specification in the presence of two subscribthe concavity of said bottom block, said ing Witnesses. a. plunger being cut away sharply and reduced SALOMON FRANK. 5 in diameter immediately at the rearof its Witnesses:

forward edge which forms the opening or JEAN GRUND, boreof the tube. CARL GBUND. 

